2 * Support for NEC-nl8048hl11-01b panel driver
4 * Copyright (C) 2010 Texas Instruments Inc.
5 * Author: Erik Gilling <konkers@android.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/spi/spi.h>
22 #include <linux/backlight.h>
25 #include <video/omapdss.h>
30 * NEC PIX Clock Ratings
31 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
33 #define LCD_PIXEL_CLOCK 23800
35 struct nec_8048_data {
36 struct backlight_device *bl;
42 } nec_8048_init_seq[] = {
43 { 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
44 { 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
45 { 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 }, { 24, 0x25 },
46 { 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
47 { 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F }, { 38, 0x0F },
48 { 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 }, { 43, 0x0F },
49 { 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F }, { 48, 0x0F },
50 { 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
51 { 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 }, { 86, 0x14 },
52 { 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 }, { 93, 0x0C },
53 { 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
54 { 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
55 { 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
56 { 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
57 { 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
58 { 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
59 { 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
60 { 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
64 * NEC NL8048HL11-01B Manual
65 * defines HFB, HSW, HBP, VFP, VSW, VBP as shown below
68 static struct omap_video_timings nec_8048_panel_timings = {
69 /* 800 x 480 @ 60 Hz Reduced blanking VESA CVT 0.31M3-R */
72 .pixel_clock = LCD_PIXEL_CLOCK,
80 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
81 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
82 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
83 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
84 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
87 static int nec_8048_bl_update_status(struct backlight_device *bl)
89 struct omap_dss_device *dssdev = dev_get_drvdata(&bl->dev);
92 if (!dssdev->set_backlight)
95 if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
96 bl->props.power == FB_BLANK_UNBLANK)
97 level = bl->props.brightness;
101 return dssdev->set_backlight(dssdev, level);
104 static int nec_8048_bl_get_brightness(struct backlight_device *bl)
106 if (bl->props.fb_blank == FB_BLANK_UNBLANK &&
107 bl->props.power == FB_BLANK_UNBLANK)
108 return bl->props.brightness;
113 static const struct backlight_ops nec_8048_bl_ops = {
114 .get_brightness = nec_8048_bl_get_brightness,
115 .update_status = nec_8048_bl_update_status,
118 static int nec_8048_panel_probe(struct omap_dss_device *dssdev)
120 struct backlight_device *bl;
121 struct nec_8048_data *necd;
122 struct backlight_properties props;
125 dssdev->panel.timings = nec_8048_panel_timings;
127 necd = kzalloc(sizeof(*necd), GFP_KERNEL);
131 dev_set_drvdata(&dssdev->dev, necd);
133 memset(&props, 0, sizeof(struct backlight_properties));
134 props.max_brightness = 255;
136 bl = backlight_device_register("nec-8048", &dssdev->dev, dssdev,
137 &nec_8048_bl_ops, &props);
145 bl->props.fb_blank = FB_BLANK_UNBLANK;
146 bl->props.power = FB_BLANK_UNBLANK;
147 bl->props.max_brightness = dssdev->max_backlight_level;
148 bl->props.brightness = dssdev->max_backlight_level;
150 r = nec_8048_bl_update_status(bl);
152 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
157 static void nec_8048_panel_remove(struct omap_dss_device *dssdev)
159 struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
160 struct backlight_device *bl = necd->bl;
162 bl->props.power = FB_BLANK_POWERDOWN;
163 nec_8048_bl_update_status(bl);
164 backlight_device_unregister(bl);
169 static int nec_8048_panel_power_on(struct omap_dss_device *dssdev)
172 struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
173 struct backlight_device *bl = necd->bl;
175 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
178 omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
179 omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
181 r = omapdss_dpi_display_enable(dssdev);
185 if (dssdev->platform_enable) {
186 r = dssdev->platform_enable(dssdev);
191 r = nec_8048_bl_update_status(bl);
193 dev_err(&dssdev->dev, "failed to set lcd brightness\n");
197 omapdss_dpi_display_disable(dssdev);
202 static void nec_8048_panel_power_off(struct omap_dss_device *dssdev)
204 struct nec_8048_data *necd = dev_get_drvdata(&dssdev->dev);
205 struct backlight_device *bl = necd->bl;
207 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
210 bl->props.brightness = 0;
211 nec_8048_bl_update_status(bl);
213 if (dssdev->platform_disable)
214 dssdev->platform_disable(dssdev);
216 omapdss_dpi_display_disable(dssdev);
219 static int nec_8048_panel_enable(struct omap_dss_device *dssdev)
223 r = nec_8048_panel_power_on(dssdev);
227 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
232 static void nec_8048_panel_disable(struct omap_dss_device *dssdev)
234 nec_8048_panel_power_off(dssdev);
236 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
239 static int nec_8048_recommended_bpp(struct omap_dss_device *dssdev)
244 static struct omap_dss_driver nec_8048_driver = {
245 .probe = nec_8048_panel_probe,
246 .remove = nec_8048_panel_remove,
247 .enable = nec_8048_panel_enable,
248 .disable = nec_8048_panel_disable,
249 .get_recommended_bpp = nec_8048_recommended_bpp,
252 .name = "NEC_8048_panel",
253 .owner = THIS_MODULE,
257 static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
258 unsigned char reg_data)
261 unsigned int cmd = 0, data = 0;
263 cmd = 0x0000 | reg_addr; /* register address write */
264 data = 0x0100 | reg_data ; /* register data write */
265 data = (cmd << 16) | data;
267 ret = spi_write(spi, (unsigned char *)&data, 4);
269 pr_err("error in spi_write %x\n", data);
274 static int init_nec_8048_wvga_lcd(struct spi_device *spi)
277 /* Initialization Sequence */
278 /* nec_8048_spi_send(spi, REG, VAL) */
279 for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
280 nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
281 nec_8048_init_seq[i].dat);
283 nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
284 nec_8048_init_seq[i].dat);
288 static int nec_8048_spi_probe(struct spi_device *spi)
290 spi->mode = SPI_MODE_0;
291 spi->bits_per_word = 32;
294 init_nec_8048_wvga_lcd(spi);
296 return omap_dss_register_driver(&nec_8048_driver);
299 static int nec_8048_spi_remove(struct spi_device *spi)
301 omap_dss_unregister_driver(&nec_8048_driver);
306 #ifdef CONFIG_PM_SLEEP
308 static int nec_8048_spi_suspend(struct device *dev)
310 struct spi_device *spi = to_spi_device(dev);
312 nec_8048_spi_send(spi, 2, 0x01);
318 static int nec_8048_spi_resume(struct device *dev)
320 struct spi_device *spi = to_spi_device(dev);
322 /* reinitialize the panel */
324 nec_8048_spi_send(spi, 2, 0x00);
325 init_nec_8048_wvga_lcd(spi);
330 static SIMPLE_DEV_PM_OPS(nec_8048_spi_pm_ops, nec_8048_spi_suspend,
331 nec_8048_spi_resume);
332 #define NEC_8048_SPI_PM_OPS (&nec_8048_spi_pm_ops)
334 #define NEC_8048_SPI_PM_OPS NULL
337 static struct spi_driver nec_8048_spi_driver = {
338 .probe = nec_8048_spi_probe,
339 .remove = nec_8048_spi_remove,
341 .name = "nec_8048_spi",
342 .owner = THIS_MODULE,
343 .pm = NEC_8048_SPI_PM_OPS,
347 module_spi_driver(nec_8048_spi_driver);
349 MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
350 MODULE_DESCRIPTION("NEC-nl8048hl11-01b Driver");
351 MODULE_LICENSE("GPL");